Luo Zhengqian, Cai Zhiping, Huang Jiafu, Ye Chenchun, Huang Chaohong, Xu Huiying, Zhong Wen-De
Department of Electronic Engineering, Institute of Optoelectronic Technology, Xiamen University, Xiamen 361005, China.
Opt Lett. 2008 Jul 15;33(14):1602-4. doi: 10.1364/ol.33.001602.
A novel multiwavelength Raman fiber laser based on the mixed-cascaded Stokes effects of phosphosilicate fiber is proposed and demonstrated experimentally. By using stimulated Raman scattering of both P(2)O(5) and SiO(2) along 1 km phosphosilicate fiber pumped with a 1064 nm double-clad fiber laser, the mixed-cascaded Raman linear cavity is formed by a pair of fiber Bragg gratings at 1239 nm, a polarization-maintaining fiber (PMF) Sagnac loop filter, and a conventional optical loop mirror. Up to 15-wavelength stable oscillations around 1320 nm are obtained with a wavelength spacing of 0.44 nm and power nonuniformity of less than 4 dB. By changing the length of the PMF in the Sagnac loop filter from 10 to 5.5 m, the wavelength spacing is adjustable from 0.44 to 0.8 nm. The extinction ratio of the laser is more than 30 dB. Excellent stability is also observed with a peak power fluctuation of less than 0.8 dB in 1 h.
提出了一种基于磷硅光纤混合级联斯托克斯效应的新型多波长拉曼光纤激光器，并进行了实验验证。利用1064nm双包层光纤激光器泵浦1km磷硅光纤时P(2)O(5)和SiO(2)的受激拉曼散射，由一对1239nm的光纤布拉格光栅、一个保偏光纤（PMF）萨格纳克环滤波器和一个传统光学环形镜构成混合级联拉曼线性腔。在1320nm附近获得了多达15个波长的稳定振荡，波长间隔为0.44nm，功率不均匀性小于4dB。通过将萨格纳克环滤波器中保偏光纤的长度从10m改变为5.5m，波长间隔可从0.44nm调整到0.8nm。激光器的消光比大于30dB。在1小时内峰值功率波动小于0.8dB，也观察到了优异的稳定性。
